• 文献标题:   Enhanced water permeation through sodium alginate membranes by incorporating graphene oxides
  • 文献类型:   Article
  • 作  者:   CAO KT, JIANG ZY, ZHAO J, ZHAO CH, GAO CY, PAN FS, WANG BY, CAO XZ, YANG J
  • 作者关键词:   graphene oxide, hybrid membrane, water channel, crystallinity, pervaporation dehydration
  • 出版物名称:   JOURNAL OF MEMBRANE SCIENCE
  • ISSN:   0376-7388 EI 1873-3123
  • 通讯作者地址:   Tianjin Univ
  • 被引频次:   107
  • DOI:   10.1016/j.memsci.2014.06.053
  • 出版年:   2014

▎ 摘  要

Pristine graphene oxide (pGO) and reduced graphene oxide (rGO) nanosheets with different physical and chemical structures were prepared, and blended into sodium alginate matrix to fabricate two types of hybrid membranes. Compared with pGO, rGO possessed smaller nanosheet size, more structural defects, less negative charges, less oxygen-containing groups, and more non-oxide regions. The hybrid membranes exhibited brick-and-mortar morphology, unusual crystallinity change, and increased free volume. Swelling resistance and mechanical stability of the hybrid membranes were both enhanced. Pervaporation dehydranon was conducted utilizing ethanol/water mixture as model to explore the selective water permeation through hybrid membranes. Due to synergy between permselectivity of water channels and crystallinity of polymer matrix, the hybrid membranes, particularly for rGO-filled membranes, exhibited improved separation performance with increased separation factor and an unusual change of permeation flux. When the rGO content was 1.6 wt%, optimum separation performance with a separation factor of 1566 and a permeation flux of 1699 g/(m(2)h) was achieved. The transport mechanism was investigated based on transport property comparison of the two types of membranes, revealing that more water channels with higher selectivity could be constructed and controlled by graphene oxide structure. Moreover, the hybrid membrane displayed a good long-term operation stability. (C) 2014 Elsevier B.V. All rights reserved.